Endless traction tread



J. D. FESTARY ENDLESS TRACTION TREAD Jan. 1926.

2 Sheets-Sheet 1 Filed Jan. 19, 1925 INVENTOR.

BY flw W, fir/Z7 @ax ,A

ATTORNEY5.

Jan. 5 1926.

1,568,371 J. D. FESTARY ENDLESS TRACTION TREAD' Filed Jan. i9, 1925 2 Sh eets-Sha,et 2

INVENTOR. Q 7 A/ BY -z f w, @m, 4 aw 1,:

ATTORNEY5,

- Patented Jan. 5, 1926.

UNITED STATES 1,568,371 [PATENT OFFICE.

JOSE n. rnsrimr, or san'rmeo mu cons, CUBA.

ENDLESS TRACTION TREAP.

Application filed January To all whom it may concern:

Be it known that I, Jose I). Fnsranr, citizen of the Republic of. Cuba, residing at 'Jaguey #2 Street, Santiago de Cuba, Cuba, have invented certain new and useful. Inn .provernents in Endless Traction Treads, of

which the followingis u specification.

This invention relates to endless traction treads, and has for it's main object to pro vide improvements in the links which form the trend. In. this invention the link is greatly simplified,- eliminating parts which are susceptible to breakage, wear and misplacement and-therefore increasing the life. of the tread. without losing any of its usual essential advantages.

More advantages and other considerations pertaining to this invention .will be deduced in the course of this specification, in connection with the figures of the accompanying drawings, wherein v Fig. i is a side elevation of a tread con structed in accordance with this invention.

Fig. 2 is a top plan view, to an enlarged scale, of two or the component links of the tread.

- Fig. 3 is a side tread links.

Figs. 4 and 5 are opposite end elevations of! link.

'Fig. 6 is a perspective view of a link.

Fig. 7 is an elevation of an inter-connecting element for the links In Figure 1 of the drawing is shown, by dotted lines,.two wheels 1 and 2, of one side of a vehicle, (not shown) round which is placed the tread constituted by a plurality of links of an identical construction, and as shown in the drawings. 1

In the drawing, is shown the link in ones tion, composed of a rectangular plate 3, placed transversely with regards'to the longitudinal plane of the wheels 1 and 2, the

elevation of one of the outer surface of said plate constituting the tread surface of the endless tread, and hav-= in its ends rounded as shown at 3'. 'From one side of the plate 3, and near each end of'the same, projects an ear 4, with a horizontal bore 4' and from the center of the said side and spaced equidistant from the ears 4, projects a wider ear -5, having a.

I horizontal bore 5.

From the ear 5, and over the inner face each sideof the on" we 8 which ex is, was. semi n. 3,511.

together by a bridge 8, and. are cut to eachform a plane surface or stop 6.- The ribs have their upper parts recessed, as shown at 6 in an irregular arched shape, and the opposite wider spaced ends of the ribs are cut to form stops 6",which extend slightly inwardly of the ribs. These rib ends have outer extensions 9 which constitute guides. for the wheels 1 and 2 of the vehicle. 4

The links when connected together, have the bores of cars 'd" on one side of a plate 3,

registeringwith the bores of the ears 4 and 5 of the opposite side of an adjacent link, said ears 7 being received between the ear 5 and the corresponding ears 4 of the plate. Through the registering bores is mounted a "pin 10, as detailed in Fig. 7 which has through its ends, bores 10 to receive a key to hold a washer 12. 1

In this arrangement "the closer ends 6 of the ribs 6, of a link, are received and play between the 'wider spaced ends 6" of the 5 adjacent link, the stop ends 6 of one oi the links coming into alignment with the stop end 6' of the adjacent link. 9

When the tread is in position as shown in Fig. 1, the stop ends Gand 6 of the links which form the upper and lower parts of the tread, are in engagement thus preventing the pivotal play of one link with another, around the bolt 10 which joins them, and thus said upper and lower parts constitute rigid members without any possibility of pivoting orfbending. But as the links move away from the central vertical ax'al line of the endless tread and continue their movement around the vehicle wheels 1 and 2, said stops become separated one from the other, acting like a scissors. The hing ing point is the bolt 10, and the parts of the chain which surround the wheels 1 and 2 remain loose and adjustable, thus avoiding the occurrence of excessive strain between the elements of the chain, andprevent'mg above described,

rnpid deterioration or breakage of the same. Althon h the links ectfrietionnll on the b 5 wheels, they do not retard the progress of the vehicle. I

It is evident that within the principles oi constrnction above described, many modifications may be made withonbdepnrting from the basic ides of the invention, so I do not wish to limit myself'to the construction but I declare that What I claim, is:

1. An endless traction belt link oompris: ing, a trend plate, pivoting lugs on the plate and in the plane of the same for piv'otally connecting it to adjacent links in. a belt, inwardly projecting spaced ribs on the inher face of the date, the adjacent end portions of the ribs eing parallel, and the specing between one pair of ends being less than that of the other, and offset lugs on the ends of each rib for cooperating with lugs on .adjacentlinks ins traction belt, the ofi'set .lngs at the one ends being parallel, and the ofiset lugs at the other ends being at right angles, to the planes of the rib portions to assen which they are respectively attached the lugs at rightnngles projecting inwardly from the ribs.

2. An endless traction. belt ing, it tread plate, pivotinglugs in the plane of, and on, the plate and pivotally connecting it to adjacent links in a belt, inwardly projecting spaced ribs on the inner face of the plate, the adjacentend portions of the ribs being parallel, and the spacing between one pair of ends being less than that of the other, and ofi'set lugs on the ends of each rib for cooperating with lugs on adjacent links in e traction belt, the offset lugs at the one ends being parallel, and the offset lugs at the other-ends being at right angles and inwardly projecting relatively to the planes of the rib portions to which they are respectively attached, the lugs parallel to their link comprisrib'portionsbeing 011 the ends which are less 45 Widely spaced from each other.

In testimony whereof I have signed my name to this specification.

JOSE D. FESTARY. 

